Biomedical subjects

M Ferrand

Publications and source records attributed to M Ferrand.

27 records · Page 2Linked to original sources

PubMed1985

Purification of the human thyroid peroxidase and its identification as the microsomal antigen involved in autoimmune thyroid diseases.

Human thyroid peroxidase (TPO) has been purified from thyroid microsomes by immunoaffinity chromatography using a monoclonal antibody (mAb) to TPO. The eluted material had a specific activity of 381 U/mg and exhibited a peak in the Soret region. The ratio of A411 to A280 ranged from 0.20 to 0.25. Upon SDS-polyacrylamide gel electrophoresis, the purified enzyme gave two contiguous bands in the 100 kDa region. Further, it has been demonstrated that sera with anti-microsomal autoantibodies from patients presenting Graves' or Hashimoto's thyroiditis diseases were able to bind to purified TPO and to inhibit in a dose-dependent manner the mAb binding to purified TPO. This suggests that TPO is the thyroid antigen termed to date the microsomal antigen.

Antibodies, Monoclonal↗

PubMed1985

Cell membrane coating with glutaraldehyde: application to a versatile solid-phase assay for thyroid membrane proteins and molecules interacting with thyroid membranes.

In defined conditions, glutaraldehyde was shown to tightly bind cell membranes to flexible microtiter plates without significant alteration of the antigenic and functional properties of membrane proteins. In the presence of 0.06% glutaraldehyde, human thyroid membranes were bound to plastic firmly enough to resist numerous washing and flicking steps; the coated membranes remained almost unaltered with regard to monoclonal antibody and thyrotropin binding as well as adenylate cyclase and peroxidase activities. Based on the use of thyroid membrane-coated microtiter plates, a versatile solid-phase assay was developed which allowed screening of anti-membrane monoclonal antibodies, detection of thyrotropin-displacing activity in hormone and antibody preparations, and monitoring of fractionation experiments of solubilized membrane antigens and thyrotropin receptor. It was concluded that the use of glutaraldehyde for coating cell membranes to flexible microtiter plates enabled the establishment of simple, rapid, and reliable assays for detection and quantitation of membrane proteins and molecules interacting with membranes.

Adenylyl Cyclases↗

PubMed1985

[Antigenic relation between thyroid peroxidase and the microsomal antigen implicated in auto-immune diseases of the thyroid].

Pools of sera from patients with Graves' disease or Hashimoto's thyroiditis highly inhibit the binding to human thyroid membranes of one of 19 monoclonal antibodies raised against preparations of human thyroid membranes. This monoclonal antibody reacts with human and bovine thyroid peroxidase and bovine lactoperoxidase but not with human hemoglobin, cytochrome c and other related molecules. These results indicate that the thyroid peroxidase and the microsomal antigen are antigenically related. These data taken together with those from other groups, highly suggest that thyroid peroxidase is the microsomal antigen involved in autoimmune thyroid diseases.

Adult↗

PubMed1985

Fertilization of a colchicine-treated gamete of the fern Marsilea vestita.

In the fern, Marsilea vestita, the addition of colchicine to the culture medium during the final stages of archegogenesis gives rise to a new distribution of cellular organelles and lipid droplets within the egg cytoplasm. These changes affect primarily the usually free space through which the spermatozoid moves towards the female nucleus. Depending on the length of the treatment this fertilization cone may disappear. Completion of fertilization, i.e. karyogamy, is only observed in the presence of this cone. When it is missing, progress of the male nucleus, which is no longer directly channeled towards the female nucleus, is notably slowed down and karyogamy does not occur. Then, male chromatin decondensation takes place in the egg cytoplasm. This event enables us to describe the structure of the sperm nucleus: it is composed of two cylindrical parallel units which, subsequently, break up into short fragments which may be the "male chromosomes".

Cell Nucleus↗

PubMed1974